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Can anyone advise if I can convert my EF's air intake duct system to that of the EL series, without causing problems due to a possible change with regards to the air balance of the intake system?
I have a shattered air duct (the one that is positioned over the rocker cover of the engine) caused by a gas backfire due to a spark plug lead failing. I have patched it up, and all is OK, but the EL one would seem to be a better bet, due to it being made of rubber (instead of rigid black plastic)
I am aware that I would need to change both ie. the one that connects to the air cleaner body, as well as the one that connects to the plenum chamber/inlet manifold.
Thanks.
I know a guy with an EF on gas. Made the change (easy as pie) and started getting another 50 km a tank.
Go to a wrecker for this stuff. Just get the pipe from the airbox through to the throttle body. Make sure you keep your EF airbox lid though, as they flow better than the EL or AU airbox lids (slightly different design).
Tickford actually put a rubber sock around the intake duct (not sure where, ask them) to stop backfire damaging the intake ducting.
The fat EF duct I think is an idea that works well in theory, but not so well in practice as there is a large pressure drop across it at cruising speed and loads. However, the Mock's boys think it is pretty good and use it on their demo car (with an EL snorkel tot he airbox). The ECU can learn how the car runs best, so don't worry about that. Fit and EL snorkel (bigger mouth) and you get more freeway speed acceleration and bottom end. Costs $30.
The only problem you will have is that the EL snorkel has a smaller diameter at the Air box lid end as compared to the EF.So you might have to either use a EL bell mouth or duct tape around the EL pipe to make it fat enough so the clamp can grip it.
On the dyno I removed my EL snorkel plus 3inch mandrel bent pipe to a K@N ram pod and it did didly squat.So that tells me there is no restriction in the piping at all.But I have been told that going from an EF to EL does increase the power somewhat and there theory behind that when the air is split into 2 when it goes over to the throttle body it reduces the air speed and quanity thus reducing power,that's why the EL one with its 3 inch piping keeps air speed the same as well as volume.Well that's my 2 cents worth.
Well with regards to your question the AU elbow would not be suitable for and EF manifold as the EL and AU have bolt holes in the manifold to hold the snorkel(plastic bit).These holes are not important on a EL or EF as the hose clamp and the construction of the rubber snorkel(bit that is attached to the throttle body) allows the hose clamp to hold the snorkel tightly where as the AU has a spring and relies on the 2 bolt holes on the manifold to hold the one piece not two piece plastic snorkel in place.You can use a hose clamp to replace the spring but there is not alot of purchase area on the rubber extension on the end of the snorkel to allow it to grip the throttle body.The 2 bolt holes are still needed.I only have a hose clamp holding my EL snorkel on the EF manifold that I have on my EA.
there is no significant difference between the EL and AU intake duct. They both have pretty much the same diameter, only a mandrel bent pipe will improve the flow noticably over these two ducts. However, increasing the throat area of the snorkel means the engine can breath a bit more (the airbox gets more air than it can breath anyway) so increasing the throat diameter of the snorkel gives you noticably better freeway speed response. These these $300 plastics junks are just large throat area snorkels - waste of money.
BTW, just to clarify, I am using "snorkel" to refer to the short pipe that sits on top of the radiator and takes air into the inlet box. Some people refer the intake duct (to the throttle body) as a snorkel.
I am running a T-Series intake snorkel to the standard EF airbox with K&N Filter on an EF II Fairmont I6. Bit of a notice especially its willingness to rev.
Will the single 3 inch mandrel bent pipe from the throttle body to airbox make a signifcant difference?? Is there any other clamps or parts I need to attach the pipe to the throttle body and airbox??
Anybody done this particular mod and where would you get it done?? Exhaust shop?? Anyone know how much???
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Yeh and.....
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